【題目】—Look! How clean the classroom is!

—Yes. I’m sure someone _______ it up.

A. cleans B. is cleaning C. will clean D. has cleaned

【答案】D

【解析】句意:——看,教室多么干凈!——是啊。我確定有人打掃過(guò)了。根據(jù)句意和語(yǔ)境判斷,現(xiàn)在教室很干凈了,說(shuō)明有人打掃過(guò)了。應(yīng)該用現(xiàn)在完成時(shí)。故選D。

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